Acid ferric arsen-tartrate.



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ACID FERRIC ARSEN-TARTRATE.

Specification of Letters Patent.

Patented June 13, 1911.

No Drawing. Original application filed September 3, 1908, Serial No.451,587. Divided and this application filed June 6, 1910. Serial No.565,392.

To all whom it may concern:

Be it known that I, CARL SoRonR, doctor of philosophy, a subject of theKing of Prussia, residing at Niederlahnstein-onthe-Rhine, (formerly atFrankfort-outbo- Main,) Germany, have invented a certain new and usefulProcess of Manufacturing Acid Ferric Arsen-Tartrate, of which thefollowing is a specification.

Just as the iron salts of phosphoric acids, which are insoluble inwater, the insoluble iron salts of the arsenic acid can be dissolved byso-called vegetable acidssuch as tartaric acid. From these solutions theacid iron salts of the complex arsen-tartaric acid can be precipitatedby neutralizing the excess of acid With alkalis. A better manner ofproducing the ferric arsen-tartrate is, to precipitate the solution ofsodium arsen-tartrate bv chlorid of iron, Fefil The properties of thisnew ferric arsentartrate salt resemble very much those of the ferricphosphor-tartrate.

Example I: By treating two molecular proportions of ferric arseniate,FeAsO (which is obtained by treating 411 parts of disodium arseniate, Na HASO with 270 parts of iron chlorid, Fe Gl with three molecularproportions of acid tartaric so dium, O H O Na, (obtained from 220 partsof tartaric acid, 0 1-1 0 and 85 parts of sodium carbonate, N a CO theyellow ferric arseniate is made liquid and changes to a green matter ofthe ferric arsen-tartrate, which forms a yellowish-green powder afterhaving been washed in water, pressed and dried in the dark.

Example II: On treating the solution of 111 parts of disodium arseniate(Na HAsO dissolved in 1000 parts of water, with 220 parts of tartaricacid (OJ-I 0 and 85 parts of carbonate of sodium (N a 00,), the samebeing heated and stirred, and on mixing this solution containing solubledisodium arsen-tartrate with a solution of 270 parts of iron chlorid (FeCl dissolved in 500 parts of water, the yellowish-green, acid ferricarsen-tartrate is precipitated at once and can be separated as describedabove.

Claim:

A process for manufacturing acid ferric arsen-tartrate, consisting in,(1) treating ferric arseniate (FeAsO with acid sodium tartrate (C H ONa) in the ratio of 2 molecules of the former to 3 of the latter, and(2) treating the obtained solution of the alkali arsen-tartrat-e withchlorid of iron (Fe Cl CARL SORGER. Witnesses:

CARL GRUND, JEAN GRUND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

